package com.ifp.opengate.boot.utils;

import java.security.MessageDigest;

import org.apache.commons.codec.digest.DigestUtils;

/**
 * 
 * @author Hing
 * 
 */
public class Md5Utils {

    /**
     * 标准MD5
     * 
     * @param data
     * @return
     */
    public static String getMd5Hex(String data) {
        return DigestUtils.md5Hex(data);
    }

    public static String getMd5Hex(byte[] data) {
        return DigestUtils.md5Hex(data);
    }

    /**
     * <pre>
     * 变种MD5 MD5签名，结果为“8a432b65b77dfbacb222c8a1cc76d1e2”, 
     * 将1-16位与17-32位对调，变为：b222c8a1cc76d1e28a432b65b77dfbac
     * </pre>
     * 
     * @param data
     * @return
     */
    public static String getVariantMd5Hex(String data) {
        String hexStr = DigestUtils.md5Hex(data);
        return hexStr.substring(16, 32).concat(hexStr.substring(0, 16));
    }

    public static String getVariantMd5Hex(byte[] data) {
        String hexStr = DigestUtils.md5Hex(data);
        return hexStr.substring(16, 32).concat(hexStr.substring(0, 16));
    }

    /***
     * MD5加码 生成32位md5码
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte)charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int)md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }

    /**
     * 加密解密算法 执行一次加密，两次解密
     */
    public static String convertMD5(String inStr) {

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char)(a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }

}